Vladimir Sergeyevich Solovyov , Влади́мир Серге́евич Соловьёв; January 28 [O.S.January 16] 1853 – August 13 [O.S.July 31] 1900) was a Russian philosopher, theologian, poet, pamphleteer and literary critic, who played a significant role in the development of Russian philosophy and poetry at the end of the 19th century and in the spiritual renaissance of the early 20th century.